In his latest NZ Climate Truth Newsletter (No 337) Dr Vincent Gray, of New Zealand, writes: "Early chemical measurements of the concentration of carbon dioxide in the earth's atmosphere have been suppressed by the Intergovernmental Panel on Climate Change. Chapter 1 of the IPCC Fourth Report entitled 'Historical Overview of Climate Chance Science' makes no mention of early measurements." Dr Gray's paper goes on to summarise and discuss this whole topic, including how increased CO2 has led to a greening of the globe.